Hoving 2010.

Study characteristics
Methods	Design: Randomized controlled trial Setting: Dutch pharmacies and primary care clinics, The Netherlands Recruitment: Passively recruited through baseline questionnaires in waiting rooms
Participants	474 adults who smoked (from GP sample) motivated to quit smoking within 6 months. 59% F, av.age 42, av. cpd 22
Interventions	Intervention: participants received a tailored letter based on responses to a questionnaire. Messages addressed perceived advantages and disadvantages of smoking cessation and anticipated difficult situations to refrain from smoking. Additionally, the tailored letter was personalized by including individual information. All personally relevant messages were then combined into a 5 ‐ 7 page letter Control: participants received a thank‐you letter after completing a questionnaire
Outcomes	Continuous abstinence at 6m Validation: None Quit attempts
Funding Source	Not reported
Author's declarations of interest	Not reported.
Notes	Strategy: Tailored print material Level: Patient Comparison type: Single component vs. standard care
Risk of bias
Bias	Authors' judgement	Support for judgement
Sequence Generation	High risk	QUOTE: "Smokers were randomised based on the colour coding on their questionnaire..."
Allocation concealment	High risk	QUOTE: "Smokers were randomised based on the colour coding on their questionnaire..."
Blinding of outcome assessors All outcomes	Low risk	Smoking status was self‐report, but contact was low, reducing potential risk of bias
Incomplete outcome data All outcomes	Unclear risk	No details on the number of participants lost to follow‐up in the control group reported